Thermodynamic Head Loss in a Channel with Combined Radiation and Convection Heat Transfer

Deodat Makhanlall^*, Peixue Jiang

Department of Thermal Engineering, Tsinghua University, Beijing, China.

DOI: 10.4236/jpee.2014.29009                

Abstract

Losses in channel flows are usually determined using a frictional head loss parameter. Fluid friction is however not the only source of loss in channel flows with heat transfer. For such flow problems, thermal energy degradation, in addition to mechanical energy degradation, add to the total loss in thermodynamic head. To assess the total loss in a channel with combined convection and radiation heat transfer, the conventional frictional head loss parameter is extended in this study. The analysis is applied to a 3D turbulent channel flow and identifies the critical locations in the flow domain where the losses are concentrated. The influence of Boltzmann number is discussed, and the best channel geometry for flows with combined heat transfer modes is also determined.

Keywords

Radiation-Convection Heat Transfer, Thermodynamic Head Loss, Entropy Generation

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Adeyinka, O.B. and Naterer, G.F. (2005) Entropy-Based Metric for Component-Level Energy Management: Application to Diffuser Performance. International Journal of Energy Research, 29, 1007-1024.
[2]	(2006) FLUENT 6.3 User’s Guide.
[3]	Modest, M.F. (2003) Radiative Heat Transfer. 2nd Edition, Academic Press, San Diego.
[4]	Yapici, H., Kayatas, N., Albayrak, B. and Basturk, G. (2005) Numerical Calculation of Local Entropy Generation in a Methane-Air Burner. Energy Conversion and Management, 46, 1885-1919.
[5]	Caldas, M. and Semiao, V. (2005) Entropy Generation through Radiative Transfer in Participating Media: Analysis and Numerical Computation. Journal of Quantitative Spectroscopy and Radiative Transfer, 96, 423-437.
[6]	Liu, L.H. and Chu, S.X. (2007) Verification of Numerical Simulation Method for Entropy Generation of Radiation Heat Transfer in Semitransparent Medium. Journal of Quantitative Spectroscopy and Radiative Transfer, 103, 43-56.